Improvement in stop-cutters for cutting continuous sheets of paper into shorter ones



r 'UNITED STATES i PATnyT O rgfgkren.

GEORGE KEEBLE, OF BRUNDISH, COUNTY OF SUFFOLK, GREAT BRITAIN.

IMPROVEMENT IN STOP-CUTTERS FOR CUTTING CONTINUOUS SHEETS OF PAPER INTO SHORTER ONES.

Specification forming part of Letters Patent No. 58,563, dated October 2, 1866.

To all whom it may concern Be it known that I, GEORGE KEEBLE, of Brundish, in the county of Suffolk and Kingdom of Great Britain, have invented a new and useful Improvement in the Stop-Cutters which are used in paper-mills for cutting continuous sheets of paper into shorter sheets for reams or bundles, of which the following is a full, clear, and exact description, reference being had to the accon'ipanying drawings, making part of this specification, in which- Figure l is a top view, and Fig. 2 is an end elevation, o f an ordinary stop-cutter for paper-mills, showing avertical central section of my :improvement as applied thereto. Fig. 3 is a side View of a detached wheel provided with a segmental gear and acam or iiange, which pertain to the ordinary stopcutter for paper-mills. Fig. et is a side elevation of my improvement considerably larger than that shown in section in Fig. 2.

In the ordinary stop-cutter for paper-mills the motion of the driving-drum `f/is controlled or stopped by a dog, c, which engages with a toothed wheel, f. Said dog is actuated by a flat spring, which is secured to some portion of the frame and extends along beneath and in contact with the arm d, and serves to lift the said arm and throw the dog c in contact with the toothed wheelf, and stop the drum gn at each revolution of the drivingwheel k. As the up-and-down motion ofthe arm d is considerable, being from seven to nine inches, the iiat spring is frequently broken, and it is very difficult to obtain a ijat spring that will endure so great a strain.

A toothed segment, l, on the wheel k engages with a gear, lm., on the shaft of the drum g and imparts motion to the drum. Each revolution of the wheel 7c turns the drum g a sufficient distance to measure off a sheet of paper of the required length, or in proportion to the number of teeth in the segment t. A cam or tlange, p,.on the side of the segment l presses the arm d downward to disengage the dog c from the wheel f and allow the drum g to turn.

-In carrying out my invention I provide a stand, A, into the top end of which I. insert a slotted tube, To the top end of said tube a cap, O, is fastened, and a spiral spring, D, encireles the tube.

A sliding rod, E, passes through the tube B, and a key, o, inserted through a hole near the lower end of the rod E, moves up and down in the slots F of the tube B.

A washer or collar, G, is movable on the outside of the tube B and rests 011 the top of the key o. The lower portion of the springr D bears on the top of the collar G, and the upper portion of said spring bears against the under side of the cap O. l

In applying my improvement to a stop-cutter for paper-mills, the stand A is fastened to the iioor H directly under the end of a lever, h, which I also provide. Said lever is secured to the rocking shaft b. The top end ot' the sliding rod E is connected with the end of the lever 7L by means of an adjustable strap or connecting-link, t', which may be tightened if the spring D should become weak by continuous use.

1 At each revolution of the wheel k the cam or flange p forces the arm l downward and disen gages the dog c from the toothed wheel j" and allows the segment l, which acts upon the gear m, to turn the drum g in proportion to the number of teeth in the segment, which regulates the length of each sheet of paper cut from a continuous sheet by a suitable cutting device; and when the cam p and segment l have passed their point of action the spring D on the tube B draws the lever h suddenly downward, causing the dog c to engage instantly with the toothed wheel j' and stop the drum g while the cutting is performed, one sheet of paper being cut at each revolution of the wheel k, segment l, and cam p.

Insteadof a spiral spring, I sometimes use an elliptic spring, which may be applied to the tube B and operated in substantially the same manner as the spiral spring, all as shown in Fig. 2.

I claimy The combination ofthe lever jl., connecting strap i, rod E, key o, collar G, tube B, stand A, cap O, and the spring I), or its equivalent, the whole arranged substantially as and for the purpose set forth.

GEORGE KEEB LE.

ln presence of- JOHN E. CRANE, J. S. WHITNEY. 

